T.2 Creating the model using the command file
As an alternatively to the procedures described in the proceeding tutorial, you can also create the same STAAD input file using the STAAD.Pro Editor.
To start a new STAAD input file using the STAAD.Pro Editor, follow the procedure described in Creating a new structure. Then select the Command File tool in the Edit group on the Utilities ribbon tab. The STAAD.Pro Editor window opens with the basic commands for your model entered.
For this tutorial, delete all the command lines displayed in the editor window and type the lines shown below. While not necessary, this will allow you to learn more about the required and optional command lines for an input file.
For most all commands and keywords, the first three letters of a keyword are all that are needed. The rest of the letters of the word are not required, but are useful to present a user-friendly command language in mostly plain English for later reference. By convention, the required letters in a command or keyword are underlined here ("PLANE" = "PLA" = "plane" = "pla").
STAAD SPACE RC FRAMED STRUCTURE
JOINT COORDINATES 1 0 0 0 ; 2 0 3.5 0 ; 3 6 3.5 0 4 6 0 0 ; 5 6 0 6 ; 6 6 3.5 6
MEMBER INCIDENCES 1 1 2 ; 2 2 3 ; 3 3 4 4 5 6 ; 5 6 3
UNIT MMS KN MEMBER PROPERTY AMERICAN 1 4 PRIS YD 300 ZD 275 2 5 PRIS YD 350 ZD 275 3 PRIS YD 350
Member properties have been defined above using the PRISMATIC attribute for which YD (depth) and ZD (width) values are provided in MM unit. When YD and ZD are provided together, STAAD considers the section to be rectangular. When YD alone is specified, the section is considered to be circular. Details are available in Technical Reference of STAAD Commands.
CONSTANTS E 22 MEMB 1 TO 5
UNIT METER KN CONSTANTS DENSITY 25.0 ALL POISSON 0.17 ALL
BETA 90 MEMB 4
In the absence of any explicit instructions, STAAD will orient the beams and columns of the structure in a pre-defined way (see General Engineering Theory for details.) In order to orient member 4 so that its longer edges (sides parallel to local Y axis) are parallel to the global Z axis, you must apply a beta angle of 90 degrees.
UNIT METER KG LOAD 1 DEAD LOAD
SELFWEIGHT Y -1
One of the components of load case 1 is the selfweight of the structure acting in the global Y direction with a factor of -1.0. Since global Y is vertically upward, the factor of -1.0 indicates that this load will act downwards.
MEMBER LOAD 2 5 UNI GY -400
MEMBER LOAD 2 5 UNI GY -600
MEMBER LOAD 1 UNI GX 300 4 UNI GX 500
REPEAT LOAD 1 1.2 2 1.5
Load case 4 illustrates the technique employed to instruct STAAD to create a load case which consists of data to be assembled from other load cases specified earlier. This repeat load case instructs the program to analyze the structure for loads from cases 1 and 2 acting simultaneously. The load data values from load case 1 are multiplied by a factor of 1.2, and the resulting values are utilized in load case 4. Similarly, the load data values from load case 2 are multiplied by a factor of 1.5, and the resulting values too are utilized in load case 4.
REPEAT LOAD 1 1.1 3 1.3
LOAD LIST 4 5
The above LOAD LIST command is a means of stating that all further calculations should be based on the results of load cases 4 and 5 only. The intent here is to restrict concrete design calculations to that for load cases 4 and 5 only.
START CONCRETE DESIGN CODE ACI UNIT MMS NEWTON CLT 25 ALL CLB 30 ALL CLS 25 ALL FC 25 ALL FYMAIN 415 ALL TRACK 1 ALL
The first line is the command that initiates the concrete design operation. The values for the concrete design parameters are defined in the above commands. Design is performed per the ACI Code. The length units are changed from METER to MMS to facilitate the input of the design parameters. Similarly, force units are changed from KG to NEWTON. The TRACK value dictates the extent of design related information which should be produced by the program in the output. The parameters specified include CLT (Clear cover for top surface), CLB (Clear cover for bottom surface), CLS (Clear cover for sides), FC(Strength of concrete), and FYMAIN (Ultimate strength of steel). These parameters are described in D1.F.3 Design Parameters.
DESIGN BEAM 2 5 DESIGN COLUMN 1 3 4